Catalytic asymmetric synthesis of planar-chiral transition-metal complexes

Planar-chiral transition-metal complexes are important chiral scaffolds in organic and organometallic chemistry and have been utilized as chiral ligands, chiral catalysts, or chiral building blocks. In spite of the usefulness of planar-chiral transition-metal complexes in asymmetric synthesis, enantiomerically enriched forms of these compounds are primarily obtained by rather classical methods. Examples of catalytic controlling planar-chirality in transition-metal species have been extremely rare, and this has been still a developing area in this field. In this review article, various methods of preparing enantiomerically enriched planar-chiral transition-metal complexes using substoichiometric chiral sources are surveyed. Most of the asymmetric reactions in these categories are transition-metal-catalyzed reactions, and there are a few examples of organocatalytic reactions. (C) 2015 Published by Elsevier Ltd.